Automatic cut-off-valve gear



(No Model.) 2 Sheets--Sheet 1. J. W. HAYES.

AUTOMATIC GUT-OFF VALVE GEAR.

Patentedfiuly 12,1887.

INVENTOR BY g m w WITNESSES ATTORNEYS.

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(No Model.) 2 Sheets-Sheet 2.

J. W. HAYES. I

AUTOMATIC GUT-OFF VALVE GEAR.

No. 366,480. Patented Ju1y'12, 1887.

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UNITED STATES JOHN XVESLEY HAYES, OF PORTSMOUTH, NEXV HAMPSHIRE.

AUTOMATIC CUT-OFF=-VALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 366,480, dated July 12,1887.

Application tiled December 1, 1886. Serial No. 220,375.

1'0 aZZ whom it may concern:

Be it known that I, JOHN XVEsLEY HAYES, of Portsmouth, in the county ofRockingham and State of New Hampshire, have invented a new and ImprovedAutomatic Out-Off for Slide-Valves and other Engines, of which thefollowing is a full, clear, and exact description.

This invention relates to a novel form of automatic cut-off forslide-valves; and the invention consists, essentially, of a revolublehead carrying a slide, to which the crank-pin for the valverod isconnected, a means for regulating the slide being provided, as will behereinafter described, and specifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a side view of my improved an tomatic cutoff, a portion ofthe case being broken away to disclose the interior construction. Fig. 2is a face view of the cut-off, the front plate being removed. Fig. 3 isa sectional view of the case, the view being taken on line x of Fig. 2,-the mechanism within the case, however, being shown in full lines. Fig.4 is a similar view of a modified construction, and Fig. 5is a detailview of the frictionwheel illustrated in Fig. 4.

In the drawings above referred to, rep resents a vertical standard,which serves as the bearing or support for a horizontal shaft,

.11, upon one end of which there is secured a gear, 12, that is arrangedto be engaged by a corresponding gear that is connected to the maincrank-shaft of the engine.

Upon the opposite end of the shaft 11 there is secured a head-block, 13,that is formed with a transverse groove or recess, 2, in which there isarranged a slide, 14, said slide being held to the head-block by plates15, which project beyond the side walls of the recess 2 and into rabbets3, that are formed in the slide.

In one end of the recess 2 there is a lug or projection, 16,which servesas the support fora screw, 17, said screw being held againstlongitudinal displacement by collars that are arranged upon either sideof the lug 16, the position of such collars being shown in Fig. 2. Thisscrew17 engages with a correspondingly- No model.)

threaded aperture that is formed in the slide 14, and upon the extendingend of the screw there is secured a bevel-pinion, 18.

The cranlrpin, to which the connecting-rod of the slide-valve is to besecured, is carried by the slide 14-, and this pin is shown at 19.

That end of the shaft 11 to which the head 13 is secured extends outwardthrough a sleeve, 20, that is made integral with or rigidly connected tothe standard 10, the outer portion, 21, of the sleeve 20 being smallerthan the inner portion; and upon this smaller portion 21 there ismounted a sleeve, 22, which carries a case, 23, said case being formedwith beveled racks 24, while the outer facing-plate, i7, of the case,which is held thereto by bolts 25, is formed with racks 26, the pinion18 riding in the annular space between the racks, as best shown in Fig.3. The case 23 is held against any rotary movement by means of afeather, 27, which is fitted between the sleeves 22 and 20, as bestshown in Fig. 4.

A governor-stand, 30, is secured to the up per end of the standard 10,the governor being of any of the well-knownforms-such, for instance, asthe one illustrated at -and this governor is driven by means of a beltwhich runs in engagement with a pulley, 31, that is carried by ahorizontal shaft, 32, the inner end of said shaft being provided with abevelgear, 33, that engages with a corresponding gear, 34, that iscarried by the lower end ofa sleeve, 35, to which the operatingmechanism of the governor is connected.

As the governor-balls are thrown outward, they act to depress aconnecting-rod, 36, which is secured to one arm of a bell-crank lever,37, said lever being pivotally mounted upon a downwardly -cxtendiugbracket, 38, that is carried by the standard 10, the other arm of thelever 37 being connected to the sleeve 22, so that said sleeve, andconsequently the case 23, moves toward or from the standard 10 inaccordance with the position of the governor, thisslidingmovementbeingregulated by means of aset screw orbolt, 39, which passesthrough an elongatedslot, 5, that is formed in the sleeve 32, the innerend of the said set screw or bolt engaging with the contracted portion21 of the sleeve 20.

Such being the general construct-ion of my improved form of automaticcut-off, the operation is as follows: When the speed of the engine isundulyincreased, the rod 36 will be depressed, and the case 23 will beconsequently thrown outward, so as to bring one of the racks 24 intoengagement with the pinion 18, and as the pinion so engages with theracks it will turn upon its bearings and the slide 14 will be moved soas to bring the crank-pin 19 closer to the axis of the shaft 11, whichmovement of the crank-pin will operate to cut off or decrease the strokeof the valve in connection with which it is arranged. On the otherhand,when the speed of the engine is too slow, the governor-balls will dropinward and the rod 36 will move upward, thereby bringing one of theracks 26 into engagement with the pinion 18, which pinion will be turnedin a contrary direction, and, so turning, will haveacontrary effect uponthe valve to the one just described.

In order that the engine may be driven at any required rate of speed, Iform the rod 36 in two sections that are united by a couplingpiece, 45,which said coupling-piece is formed with internal right and left handthreaded sockets, into which the correspondinglythreaded approachingends of the two sections of the rod fit, the arrangement being such thatthe rod may be shortened or lengthened so as to regulate the operationof the cut-off.

As clearly shown in the drawings, the facing-plate 47 is formed with alarge central aperture, through which the crank-pin 19 extends, andwithin which said pin revolves, the defining edge of the said centralaperturebeiug V-shaped, as shown at 7.

The slide 14 carries two outwardly-extendings dogs, 8 and 9, the dog 9being formed with a beveled end adapted to bear against the-innerbeveled face of the edge 7, while the dog 8 overhangs the edge and isprovided with a beveled face that bears against the outer beveled faceof the edge 7, the arrangement being such that the segmental racks areprevented from carrying the crank-pin too far in either direction, as atthe allowable limit of movement of the slide one of the dogs will bebrought against the face against which it is intended to bear and afurther engagement of the pinion prevented. The racks are made segmentalto prevent a too rapid movement of the valve as a cut-off.

In Fig. 4 Iillustrate aconstruction wherein I employ a friction-wheel,46, instead of a pinion, 18, and wherein the casing 23 and its cover areformed with friction bearing-surfaces 48 and 49, the friction-wheelbeing formed with a corrugated peripheral face, while thefriction-surfaces 48 and 49 are also corrugated; and in order that thecorrugation of the wheel may fit within the corrugations of thebearingsurfaces 48 and 49, I mount the wheel 46 upon the screw 17 bymeans of a feather, 6, which feather permits of a longitudinal movementof the wheel 46 upon its bearings, but prevents any rotation of thewheel upon said bearings. This friction-wheel and its bearing-surfacesare of course to be considered as the mechanical equivalent of thepinion and its racks.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In an automatic cut-off,the combination,with a governor, of a revoluble head, a slide carried thereby andprovided with a crankpin, a screw arranged in connection with the slideand provided with a pinion, a circular rack,and connections between therack and the governor, substantially as described.

2. In an automatic cut-off, the combination, with a governor, of arevoluble head, a slide carried thereby and provided with a crank-pin,

a screw arranged in connection with the slide connections between thecase and the governor,

substantially as described.

- 4. In an automatic cut-off,the combination, with arevoluble head, of aslide carried thereby, a crank-pin carried by the slide, a screw carriedby the head and arranged to engage with the slide, a pinion carried bythe screw, a sliding case provided with opposed racks, a governor, abell crank-lever, a connecting-rod arranged between the governor and thelever, and a means for adjusting the length of said rod, the bell-cranklever being connected to the sliding case, substantially as described.

5. In an automatic cut-off, the combination, with a revoluble shaft, ofa head carried thereby, a slide mounted in a recess formed in said'head,acrank-pin carried by the slide, a

screw provided with a pinion and mounted upon the-head and arranged toengage with the slide, a case formed with racks, a facingplate alsoformed with racks and with a central opening having a V-shaped definingedge, dogs carried by the slide and arranged to bear against theinclined faces of the V-shaped edge of the facing-plate, a governor, andconnections between the slide-case and the governor,- substantially asdescribed.

JOHN WESLEY HAYES. Vitnesses:

CALVIN PAGE, FRED A. HoY'r.

